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Originally Posted by CometGuy
More wonderful pics from Bert overnight posted at:
http://www.pbase.com/terrylovejoy/hu..._first_results
For comparision I have posted a 180 second shot made with my 300D + 50mm lens to compare with Berts 5D + 85mm lens (similiar field of view). To be fair on the 300D  the shot was made at 3x slower optical speed (f3.5 vs f2) and in 26 C ambient versus 12 C (according to BOM records). Its possible I was using the Peltier cooler so equivalent temperature would have then been ~20C. When it is clear again I'll do a 10sec 50mm f2.0 shot of Orion with the 300D to get a better comparision. However, it is clear there have been some major improvements in noise and sensitivity!
Terry |
Hi Terry
The 5D certainly looks like a keeper! I had a go at processing Bert's 82 sec Orion and had a lot of trouble dealing with the vignetting. I note that your processing of that pic has similar problems. I used ABE to do the job, but it left the image with a large dark ring in the centre (similar to your's but worse). It would appear that the combination of the sensor size and the sensitivity of the chip are accentuating the vignetting of the lens much more than previous models. I would be really keen to see the same shot processed with a flat frame. Bert: any chance?
Cheers